Carburetor



Patented Oct. 14, 1930 UNITED STATES PATENT OFFICE GEORG ASHTON, OF GEISELGASTEIG, NEAR MUNICH, AND GOTTFRIED FREI, OF MUNICH, GERMANY, ASSIGNORS TO ARNOLD HAEFELI, OF MUN ICE, GERMANY CARBURETOB Application filed August 15, 1927, Serial No. 218,022, and in Germany April 16, 1927.

The present invention refers to improvements in carburetors in which the fuel is discharged from a long longitudinally slotted nozzle and the regulation of the charging mixture is effected by means of a horizontally disposed piston valve.

One feature of the present invention is a carburetor in which the horizontal piston valve slides directly on the slot of the nozzle.

Another feature consists in arranging the horizontal piston valve to be turnable instead of reclprocable.

Constructional examples of the subject matter of the present invention are illustrated on the accompanying drawings, in

which Fig. 1 is a longitudinal section of a first V constructional example;

Fig. 2 is a section along line IIII in Fig. 1;

Fig. 3 is a longitudinal section of a second constructional example;

Fig. 4 is a section along line IVIV in Fi 3' F ight is a modification of a detail;

Fig. 5 is a longitudinal section of a further embodiment of the invention;

Fig. 6 is a section along line VIVI in Fig. 5; ig. 7 shows the valve, and 8 Fig. 8 is a section along line VII1VIII in F i 5.

Re erring now to the first constructional example illustrated in Figs. 1 and 2 the casing enclosing the float 1 is designated with 2. The fuel enters the float chamber at 3 and passes through the channel 4 into the space 5 below the rodshaped nozzle 6. The operative part of the nozzle is hollow and the fuel is drawn through openings 7 into the interior of the nozzle 6. The longitudinal slot 8 is provided in the upper part of the nozzle. The piston valve 9 slides directly on the slot 8 of the nozzle. The primary air for the charging mixture enters at 10 and sweeps past the slot 8 and is drawn into the motor at 11. The piston valve 9 is provided in its lower portion with a groove 12. The screw 13 serves for conveniently adjusting the idle-running position of the piston valve 9 from outside of the carburetor. When the screw 13 is screwed home the gap 14 determining the idle-running position is made larger and vice versa.

The groove 12 serves for supplying auxillary air, which flows in the direction of the arrow 15 and gets into contact with the fuel within the nozzle whereby an atomizing efiect is obtained already within the nozzle.

The regulation of the charging mixture occurs in the known manner by endwise displacing the piston valve 9, whereby the crosssection of the area through which the drawn in air flows is regulated as well as the effective length of the slot.

Thetsame atomizing effect within the nozzle is obtained with the carburetor illustrated in Figs. 3 and 4. The nozzle 6 is again provided with calibrated holes 7 at the bottom 7 and with a slot 8 at the top through which the fuel is drawn. The piston valve 9' is not provided with a groove as in the first constructional example for atomizing the fuel within the nozzle. To obtain the same ef- 7. feet a central bore 16 is provided in the nozzle 6 through which auxiliary air is sucked into the nozzle for partly atomizing the fuel within the nozzle. In order to determine the quantity of fuel required for idle-running a partition wall 17 provided with a hole 18 is inserted in the nozzle 6. By varying the position in which the partition wall 17 is inserted the idle-running may be very accurately adjusted. This partition wall may also be used with the first constructional example illustrated in Figs. 1 and 2.

The cross-section of the regulating piston valve may also be rectangular instead of cylindrical as is shown in F ig. 4" in which the lower side of the rectangular cross-section of the piston valve 9 is slightly curved to correspond to thecurvat'ure of the round nozzle 6.

The constructional example illustrated in Figs. 5-8 differs from the above described constructional examples inasmuch as instead of an axially displaceable piston valve a rotatable valve 9" is provided for the main air. The latter is operated by known throt- 1.10

tle control means not illustrated and acting on a lever 19. The valve 9" is provided with an oblique controlling edge 20 shown in Fig.

20 permits to obtain a gradual opening of the 7 mary air supply extending across the s ot;'

passage area on turning the valve. A screw 13 cooperates with a recess 22 in the valve for ad usting the angular position of the valve 9 which correspond to the idle running of the motor.

\Ve claim: 1

1. In a carburetor, the combination with a casing, a float chamber, a vertical chamber connected therewith, an adjustable tube at the top of the vertical chamber, inlet and discharge for fuel for said tube, said inlet communicating with said vertical chamber and an air supply extending transversely past said discharge; of a piston member sliding, over'said discharge and controlling the :air 7 supply, and means to closing ofi'of the air.

. 2. In a carburetor, the combination with a casin ,a float chamber, a narrow vertical cham er connected with the float chamber, a

prevent the complete tubular member at the topv of the vertical chamber having inlet openings in its bottom communicating with the vertical chamber and a discharge slot at its top, and a riof a single control member controlling both the slot and the primary air supply, and means in one of the members to supply auxiliary air to the tubular member at the portion of the slot not swept by primary air, and means to prevent the closing oil of the primary air;

3. In a carburetor, thev combination with a casing, a float chamber, a narrow vertical chamber connected with the float chamber, a rotatably adjustable tube at the top of said narrow chamberhaving fuel inlet orifices in its bottom communicating with said vertical chamber and a slot in'its top and a primary air supply extending transversely. of the slot; of a, longitudinally movable piston cooperating with said slot. adjustable means to limit the movement of the piston, means to admit air directly into said tube said piston'controlling the primary airacross the tube, and a perforated partition in the tube.

In testimony that we claim the foregoing as our invention, we have signed our names.

DR. GEORG ASHTON. GOTTFRIED FREI. 

